Organometallic Compounds are defined by which bonding feature?

• A. Ionic bonds between metals and nonmetals
• B. Covalent bonds exclusively between carbon atoms
• C. Magnetic bonding between metal centers
• D. A bond between carbon and a metal

Answer: (D)

The defining feature is a direct bond between a metal atom and a carbon atom of an organic fragment. That metal–carbon bond is what unites the inorganic metal center with an organic ligand, which is the hallmark of organometallic chemistry. Examples include many metal–alkyl or metal–aryl complexes and well-known cases like Grignard reagents (carbon–metal bonds) and transition-metal alkyls.

Why the other descriptions don’t fit: ionic bonds between metals and nonmetals describe typical inorganic salts, not the key metal–carbon linkage. covalent bonds exclusively between carbon atoms define organic chemistry rather than organometallics. magnetic bonding between metal centers is not how organometallics are defined and doesn’t capture the essential metal–carbon interaction.